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RE: st: Help about Ranksum - porder option
It is possible to get confidence limits corresponding to the -ranksum-
test. If Óscar wants a confidence interval for the -porder- parameter, then
one possibility is to use the -somersd- package, downloadable from SSC. If
this is installed, then you can type
somersd control series, tr(c)
and -somersd- will print out a confidence interval for the -porder-
parameter. The -somersd- package can also produce confidence limits for
If Óscar wants a confidence interval for the median difference between
controlled and uncontrolled values of -series-, then this can be done with
the program -cendif- (part of the -somersd- package). To do this, type
cendif series, by(control)
The -somersd- package can calculate a wide range of other confidence
intervals for rank statistics, and these are described in the .pdf manuals
distributed with -somersd-.
I hope this helps.
At 17:38 31/10/2005, Nick Cox wrote (in reply to Óscar Becerra):
A t test springs to mind, provided that its assumptions
are reasonably satisfied.
Plotting a graph springs even more to mind.
> Thanks, and can anyone suggests to me a procedure to perform
> this test?
> porder is taking all possible pairs (control=yes paired with
> each control=
> no) and asking in what percent of those pairs is No larger
> than YES; this
> does not appear to be the question you are asking; if I
> correctly understand
> your question, I think you want a parametric procedure rather than the
> rank-sum test
Lecturer in Medical Statistics
Department of Public Health Sciences
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